Public bug reported:
While updating ubuntu 14.04 to 16.04.1............
$sudo do-release-upgrade
An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1608799
Title:
not able to upgrade from 14.04 to 16.04.1
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